Lets take a look at the most valuable cards in Disney Lorcana: Wilds Unknown
As an example, a mono-Blue deck could use Dovescape instead of the deck needing to be White AND Blue to start with
When you next cast a creature spell this turn, that creature enters with two additional +1/+1 counters on it
3 Uncommons, including double-faced cards (DFCs) Here you can find any of the 81 MH3 uncommons (2.4 cards on average) and the 20 MH3 double-faced uncommons (0.6 cards on average)
If thats not fitting for the problem youre facing, you can also choose to have all creature tokens get -2/-2 until the end of the turn, which is going to be great against Wolf tokens, Zombie tokens, probably Human tokens and basically every other creature token too
Moving +1/+1 counters onto planeswalkers to give them additional loyalty is very powerful but the card costs 5 mana to play 2 more to activate and needs to be tapped so it cant be done more than once on its own